Tool



Feb.26,1194e. H BROWMNG 2,395,450

' Toor.

Filed nec. l19, 1944 Patented Feb. 26, .194e

TOOL

\ yl-larry* Browning, Louisville, Kyi, assigner to I. v du Pont de Nemours & Company, Wilmington,

Del., a corporation of Delaware Application December 19, 1944, Serial No. h568,898 s claims; (01.154-41).

This inventionrelates to device'ssuitable for use in. rmaking linings of plastic material for apparatus such as pipes andtanlrs.

In the lining of apparatuswth plastic ma-R` terial, such as a lining of rubber, the'walls of theiapparatus 'arel coated with a-cement and sheets of unvulcanized rubber are applied to the walls. The sheet material is then rolled for eliminating air spaces-and irregularities inthe sheet and then the edgesof thesheets are joined.z Finally the apparatus is heated for lvulcanizing the rubber.

. This method of applying the coating material has not been followed for liningcylindrical pipes of small sizes where space limitations do not permit the use of hand operated rollers. For lining the latter structures, the uncured lining material such as unvulcanized rubber Yin the form of a hollow cylinder is inserted in the pipe and then vthe lining is expanded into contact with the inner wall of the pipe by the action of compressed airduring the vulcanization of ythe rubber. This prollning material for mechanically compressing and working-it into contact with the vcylinder to be lined. p

Referring to Fig. 1,'sets of contactv rollers l are mounted to'reyolve at opposite ends of the auxiliary shafts 2. I The Vrollers, I are of somewhat greater diameter than the shafts and leach is? mounted to revolve around the axis of itssupporting shaft., l'lheauxiliary shafts 2 are disposed radially and parallel with respect to a main rotatable shaft 3and areY mounted at `ornear the cedure is not satisfactory in that the air pockets between the lining and the tube are notalwaysf eliminated, any air initially entrapped betweerif/ the lining and the tube expands when heated andi/25 enlarges the pocket, any leakage of air throughg Ythe tubular lining during vulcanization formseY new air spaces or enlarges those alreadyfformed and the lining does not become as firmly bonded to the wall as a mechanically worked lining. It is therefore desirable to provide meansapplicable to tubularlbodies of small diameter for mechanically working the lining material. Y p

It is among the objects of the present invention to provide a device'whieh is convenient for use in the preparation of plastic linings for tubular bodies. Another object of the invention is to avoid diiiiculties heretofore encountered lin making such linings. The foregoing and other objects will be apparent from the following description in which the principle, embodiment and method of. putting the invention into effect are set forth and illustrated with reference to the drawing in which Fig. 1 is a view in lperspective of agdevice for use in lining pipes,

Fig. 2 is a crosspsectonal view taken along the line 2 2 of Fig. 1, and g 1 Fig. 3 is a view partially in elevation andpartially in cross section of a detail of the device shown in Fig. 1.

Theobjects-of the invention are attained in general by providing a system of rollers which is supported upon and around a central shaft.

holes.

endof the shaft 3. The mountingof'the auxiliary shafts 2 'is arranged/so that. the auxiliary shafts will travel in planes determined bythe Vradii of the.`v

main shaft and so that the axes of the auxiliary shafts will be free to move to and from the axis of the main shaftin their several planes of action.

Any number of auxiliary shafts and 'rollers .may be provided as long as theyare suilcient in num- .ber to carry the main shaft 3 as'a floating shaft,

The main-shaft 3 is preferably provided with an enlargement or head 4 upon which the auxiliary shafts 2 are mounted. The headed may be made integral with the shaft or it may be provided by screwing the thread end 5 of the shaft into the threaded end' of the head. The head 4,

is preferably but vnot necessarily provided with plane faces which are provided with bores 6 passing through the mainaxis and through which the supporting pins l are mounted to reciprocate.

The auxiliary shafts 2 are mounted integrally on the parallel supporting pins l. This may be done by welding or brazingthe ends of the pins 'l in suitable openings in the shafts 2 or asjby threading and screwing the. pins in to threaded l,

Coil springs 8 are mounted on the pins 1 and biased between the auxiliary shafts 2 and the 'main shaft 3 for retaining the auxiliary shafts in outward .positionsl with .respect to the main shaft. The roller supports are mounted onthe main shaft by inserting the-pins 1 through the openings '6 and retaining them against `the bias of springs -B by the pins I0. At least two sets of pins 1 and springs 8 are provided for each auxiliary shaft so that the rollers at the ends of the shafts will beheld lin desiredalignrnent with the axis of main shaft 3 but the pins for supporting one auxiliary shaft are staggered with,v

respect to the pins of another auxiliary shaftso that. the corresponding rollers 2 of theA several shafts will lay in the same transverse planesand the pinswill pass kthrough the head I of the shaft independently of each other.

The rollers l maybe securedat the ends of- The system is' arranged to expand lagainst the auxiliary shaftsv 2 by providing a eountersunl:

such as a pipe with rubber, the inside surface of the pipe is rst coated with a rubber cement or binder. A sheet of unvulcanized rubber cut so as to coverthe inside vof the pipe with considerable overlapping and curved generally into the form of a tube is then drawn into the pipe to be lined. The auxiliary shafts 2 of the working tool heretoforeldescribed are compressed against the springs 8 untilthe tool can be inserted' into the tube and then they are released so that the rollers I` bear against the unvulcanized rubber at the end of the pipe. The tool is then rotated and slowly advanced through the pipe, thereby mechanically working the entire surface of the lining material into a uniform layer of unvulcanized rubber integral with the pipe. The rubber is then cured by heating in the usual known manner. v

The device may be revolved by a hand crank attached to the shaft 3 or the shaft '3 may be power driven. In making linings, different speeds of revolution will be found to be desirable for making different kinds of linings. For working a lining of unvulcanized rubber in a pipe 3 to 6 inches in diameter, a speed of rotation of about 60 revolutions per minute with a lineal rate of 4advance through the pipe of about 16 inches per minute is generally sufficient working to produce a satisfactory continuous integral coating of unvulcanized material of` substantially uniform thickness, but these rates of rotation and advance may be varied to suit the characteristics yf the lining to be installed.

ent diameters and to attach them to the shaft I by a screw connection such as that shown in Fig. 3.

The rollers I are provided with cylindrical surfaces of more or less length depending upon the type of manipulation needed to work the lining material, and the'rollers ar rounded at least at their leading edges so that they will not 'gouge the lining material, especially before it is worked into contact with the inside surface ofthe pipe. A rounded edge of considerable radius is desirable at least on the leading edges of the rollers lso that all vup-strucl: seams and roughness in lustrations thereof herein set forth.

y Iclaim:

1. In a device of the kind described a main rotatable shaft, a plurality of non-rotatable auxiliary shafts mounted on and around said main shaft with their axes parallel, pin members integral with said auxiliary shafts mounted in sliding engagement in radial openings through' said main shaft, spring means biased between said main and auxiliary shafts and means to retain said pin members in said radial openings, and cylindrical rollerson the ends of said auxiliary shafts having their outer edges rounded.

2. .A device in accordance with claim 1 in which the main shaft is provided with an enlarged head portion and the means for supporting the auxiliary shafts are carried by the enlarged head portion.

3. A device in accordance with claim 1 in which the main shaft is provided with an enlarged head having plain portions thereon parallel to the axis of the shaft, said radial openings through said main shaft being directed through said plain portions. v

HARRY BROWNING.

details of 

